/*
 * Copyright 2018-2020 Pnoker. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.dc3.driver.service.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.handler.timeout.WriteTimeoutHandler;
import lombok.SneakyThrows;
import org.springframework.stereotype.Component;

import java.net.InetSocketAddress;

/**
 * @author pnoker
 */
@Component
public class NettyUdpServer {

    @SneakyThrows
    public void start(int port) {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(group)
                    .channel(NioDatagramChannel.class)
                    .localAddress(new InetSocketAddress(port))
                    .handler(new ChannelInitializer<Channel>() {
                        @Override
                        protected void initChannel(Channel channel) {
                            channel.pipeline().addLast(
                                    new WriteTimeoutHandler(30),
                                    new NettyUdpServerHandler()
                            );
                        }
                    });
            ChannelFuture future = bootstrap.bind().sync();
            future.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully().sync();
        }
    }
}